sdl_sysloadso.c

SDL库 在进行视频显示程序spcaview安装时必须的库文件

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    [e-mail]
*/
#include "SDL_config.h"

#ifdef SDL_LOADSO_DLOPEN

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* System dependent library loading routines                           */

#include <stdio.h>
#include <dlfcn.h>

#include "SDL_loadso.h"

void *SDL_LoadObject(const char *sofile)
{
	void *handle = dlopen(sofile, RTLD_NOW);
	const char *loaderror = (char *)dlerror();
	if ( handle == NULL ) {
		SDL_SetError("Failed loading %s: %s", sofile, loaderror);
	}
	return(handle);
}

void *SDL_LoadFunction(void *handle, const char *name)
{
	void *symbol = dlsym(handle, name);
	if ( symbol == NULL ) {
		/* append an underscore for platforms that need that. */
		size_t len = 1+SDL_strlen(name)+1;
		char *_name = SDL_stack_alloc(char, len);
		_name[0] = '_';
		SDL_strlcpy(&_name[1], name, len);
		symbol = dlsym(handle, _name);
		SDL_stack_free(_name);
		if ( symbol == NULL ) {
			SDL_SetError("Failed loading %s: %s", name, (const char *)dlerror());
		}
	}
	return(symbol);
}

void SDL_UnloadObject(void *handle)
{
	if ( handle != NULL ) {
		dlclose(handle);
	}
}

#endif /* SDL_LOADSO_DLOPEN */